Sewing-machine.



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SEWING MAGHINE.

APPLICATION FILED APR. 26. 1899.

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CHARLES G. KRAMER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE UNION SPECIALSEWING MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SE WING-MA CHINE Application filed April 26, 1899. Serial No. 714,555.

Patented April 21, 1908.

To all whom it may concern:

Be it known that I, CHARLES GI KRAMER, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Sewing-Machines, ofwhich the following is a description, reference being had to theaccompanying drawing and to the letters and figures of reference markedthereon.

My invention relates to an improvement in sewing machines, the objectbeing especially to provide a machine of the chain stitch type, which iscapable of greater adjustment than those heretofore used.

. The ordinary double chain stitch sewing machine of the Union Specialty e is, as is well known, provided with an oscl lating bar upon whichis supported a looper rocker hav ing in its upper part -a socket inwhich the I shank of the looper is secured.

It has been heretofore pro osed to provide more than one socket where yaplurality of loopers may be arranged on the same rocker but in such anarrangement of a single rocker,

of course, the capability of adjustment of the machine to accommodatedifferent gages or difiglerent widths of seams is more or less limite wThe present invention is designed for increased adjustment to adapt itfor almost any gage seam and primarily consists in providing upon thelooper supporting shaft or bar a plurality of looper' rockers, allactuated from the same source and correspondingly timed and byincreasing the number of rockers as well as the number of loopers uponthe rockers very many rows of stitches may be sewed at the same time,and a seam of maximum width be made.

In the accompanying drawings, Figure 1 is a side elevation of so much ofa sewing machine of the well known Union S ecial type as is necessary toa complete un erstanding' of the invention, Fig. 2 is a top plan view ofthe front portion of the machine, the goose neck and bed plate beingremoved; Fig. 3 is a perspective v1ew enlarged of the forward art of themachine, the feeding mechanism being omitted Fig. 4 is a detail view ofthe looper rocker supporting shaft or arm detached; Fig. 5 is a detailview of one of the looper rockers looking towards the heel of thelooper; and Fig. 6 is a view similar to Fig. 4

showing an arrangement whereby the rockers may be adjusted.

In these drawings, A represents as a whole a Union Special sewingmachine of the type illustrated in Patent #299,568, of June 3, 1884,granted to Muther & Dearborn. In the present instance, the invention isshown as applied to a machine having a very wide presser foot 1, withtwo adjustable needles arranged diagonally to each other respecting theline of feed and at a great distance apart but, of course, it will beunderstood that the number and arrangement of needles may be changed inaccordance with the style of work or width of seam required to be sewed,the loo ers, of course, being changed in number an arrangement as willhereinafter be described.

2 represents a drop bar or' frame pivoted at one end as shown at 3, andat the other end attached to a rock shaft oscillated from the maindriving shaft 4 in the manner referred to in connection with the abovementioned patent. This drop frame or bar in the present instance, isshown as provided with two looper rockers, one behind the other, eachcarrying a single looper 5 cooperating with a needle 6. Each looperrocker 7 has a separate pitman connection of the ordinary kind with theneedle lever of the sewing machine and they are timed to move backwardand forward and sidewise in unison.

In Fig. 6, instead of the drop bar or frame 2 upon which the looperrockers 7 are pivoted, a rock shaft (1 is j ournaled in a bearing 1) onthe machine frame and oscillated by means of a fork which embraces aneccentric on the driving. shaft 4. This rock shaft a has pivoted to itlinks 0 which at their upper ends are pivoted to a bar 11 operated bythe pitman e from the needle lever extension and this bar at carries theadjustable looper holdersf. It will be understood, of course, that eachrocker might have two or more 100 ers upon the same, each cooperatingwit a needle thus increasing the rows of stitches; or any one looper maybe arranged to cooperate with two needles arranged side by slde, thus,for example, where four loopers are used mounted on two rockers and twoneedles with each loopers, there would be eight rows of stitching uponthe top of the goods and four rows beneath. The needles in the needlehead carried by the needle bar can be ranged one made adjustable toconform to the adjustment of the loopers. Any suitable arrangement oftake up may be used in connection with the looper threads and I haveherein shown an old form with the addition of a guiding eye '8 for thethread, but it will be un-- derstood that any other form of take upwhich would suit the purposes may be applied. As a convenient way ofsecuring the looper rockers which are composed of a sleeve 9 with anupwardly projecting arm 10 having a lug 1 1 in which is secured a ballstud for the attachment of the actuating pinion, which upward extendingarm has also a socket for the reception of the looper shank, I haveprovided a washer 13 which rests against the edge of the drop bar orframe 2 and has an outwardly projecting conical hub upon which thelooper rocker fits, the parts being secured together by a screw 14,having a conical head 15 which passes through the drop frame or bar 2and is secured by a small nut 16 upon the opposite side, the head of thewasher 13 being as shown in Fig. 4 riveted to the drop bar or frame,while in Fig. 6 it is secured by set screws, in order to make itadjustable. Of course, the washer may be integral with the drop bar orframe and it may be preferred in practice to construct it that way.

Having thus described my invention,what I claim as new and desire tosecure by Letters Patent, is:

1. In a sewing machine, a driving shaft, a frame, a plurality of loopersupports pivotally connected to said frame, loopers carried by said suports, said supports being arbehind the other in the direction of thelength of the loopers, connections between the looper supports and thedriving shaft for vibrating said looper supports lengthwise the framewhereby said loopers are moved in the direction of their length,

and means for oscillating the frame carrying the looper supports in adirection transverse to the direction of length of said. loopers;substantially as described.

2. In a sewing machine, a driving shaft, a frame or bar, a plurality oflooper supports adjustably secured thereto, loopers carried by saidsupports, said looper supports being arranged one behind. the other inthe direction of the length of the loopers, and connections between thelooper supports and the driving shaft for giving to said loopersvibrating movements in the direction of their length; substantially asdescribed.

3. In a sewing machine, a driving shaft, a frame or bar, a plurality oflooper supports adjustably secured thereto, loopers carried by saidsupports, said looper supports being arranged one behind the other inthe direction of the length of the loopers, and connections between thelooper supports and the driving shaft for giving to said loopersvibrating movements in the direction of their length, said connectionsincluding a single pitman rod connected at one end with the supportingbar or frame, and at the other end with the needle lever; substantiallyas described.

4. In a sewing machine, a framework comprising a rock shaft, a barhaving link connection therewith, and adjustable looper supports on saidbar, arranged. one behlnd the other in the direction of the length ofthe looper, and means for operating the loopers; substantially asdescribed.

In testimony whereof I affix my signature, in presence of two witnesses.

CHARLES G. KRAMER.

Witnesses:

RAYMOND S. WILLIS, Crrnsrnnv MoNEIL.

